convert csv to datatable in asp.net

 public DataTable convertcsvtodatatabledemo(string csvfilename)
        {

            string[] Lines = csvfilename.Split(Environment.NewLine.ToCharArray());
            string[] Fields;
            Fields = Lines[0].Split(new char[] { ',' });
            int Cols = Fields.GetLength(0);
            DataTable dt = new DataTable();
            //1st row must be column names; force lower case to ensure matching later on.
            for (int i = 0; i < Cols; i++)
                dt.Columns.Add(Fields[i].ToLower(), typeof(string));
            DataRow Row;
            for (int i = 1; i < Lines.GetLength(0); i++)
            {
                Fields = Lines[i].Split(new char[] { ',' });
                if (Fields.Length > 5)
                {
                    Row = dt.NewRow();
                    for (int f = 0; f < Cols; f++)
                        Row[f] = Fields[f];
                    dt.Rows.Add(Row);
                }
            }
            return dt;
        }